US2648525A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Core-breaking drill bit for doubleflute augers
Assignee: Individual
•
Filing: 1948-06-09
•
Granted: 1953-08-11
•
Expires: 1968-06-09
Abstract
No abstract record available.
Inventors
- 👤 Phipps Orville
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:24
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/44
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US218374A
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US756339A
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US932071A
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US1387733A
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US1461548A
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US1403711A
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GB351337A
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GB500147A
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US2239461A
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GB528593A
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US2339104A
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US2461305A
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GB592087A
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GB599451A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-10 | 1957-02-09 | 1957-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-10 | 1961-02-09 | 1961-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-10 | 1965-02-09 | 1965-08-11 | $7700.00 | Window Closed / Lapsed |